Georges Moustaki was one of French chanson’s most creative exponents, penning profoundly moving and playfully unpredictable songs. He sprinkles Edith Piaf’s cabaret classic “Milord” with cheeky verses and Yves Montand’s lovelorn “De shanghaï à bangkok” with skittering rhythms. But he’s also responsible for some downright gorgeous ballads—sung by Barbara and Cora Vaucaire.